HomePhysicsQuantum computing in silicon have 99% accuracy

Quantum computing in silicon have 99% accuracy

UNSW Sydney-led research paved the path for large silicon-based quantum processors for real-world application.

Australian scientists proved that near error-free quantum computing is possible. This paved the way to build silicon-based quantum devices. These devices are compatible with current semiconductor manufacturing technology.

Quantum computing in silicon hits the 99% threshold

The research paper was published in Nature. The paper confirms robust, reliable quantum computing in silicon is now a reality.

  • Morello et al got 1-qubit operation fidelities up to 99.95 percent. It also got 2-qubit fidelity of 99.37 percent with a three-qubit system comprising an electron and two phosphorous atoms. It is introduced in silicon via ion implantation.
  • A Delft team form Netherlands got 99.87 percent 1-qubit and 99.65 percent 2-qubit fidelities. They have used electron spins in quantum dots formed in a stack of silicon and silicon-germanium alloy.
  • A RIKEN team in Japan got 99.84 percent 1-qubit and 99.51 percent 2-qubit fidelities in a two-electron system using Si/SiGe quantum dots.
A visualisation of UNSW’s three-qubit system
A visualisation of UNSW’s three-qubit system, which can perform quantum logic operations with over 99% accuracy. (Quantum operation fidelities above 99% were obtained in a three-qubit silicon quantum processor. The first two qubits (Q1, Q2) are the nuclear spins of individually-implanted phosphorus atoms (red spheres). The third qubit (Q3) is the spin of an electron that wraps around both nuclei (shiny ellipse).). Credit: Tony Melov / UNSW

Scientists certified the performance of their quantum processors using a sophisticated method named gate set tomography. It is developed by Sandia National Laboratories in the U.S.

Scientists have demonstrated the preserving of quantum information in silicon for 35 seconds, because of the extreme isolation of nuclear spins from their environment.

The trade-off was isolating the qubits and made it impossible for them to interact with each other. It was necessary to perform actual computations.

Nuclear spins learn to interact accurately

The new study describes how scientists overcame the problem by using an electron encompassing two nuclei of phosphorus atoms. Scientists said, the existing computers deploy some form of error correction and data redundancy. The laws of quantum physics pose severe restrictions on how the correction takes place in quantum computer.


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